mirror of
https://github.com/torvalds/linux.git
synced 2024-11-24 05:02:12 +00:00
a4a4659d86
Since commit ee6d3dd4ed ("driver core: make kobj_type constant.") the
driver core allows the usage of const struct kobj_type.
Take advantage of this to constify the structure definition to prevent
modification at runtime.
Link: https://lkml.kernel.org/r/20230220-kobj_type-mm-cma-v1-1-45996cff1a81@weissschuh.net
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Cc: Wedson Almeida Filho <wedsonaf@gmail.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
113 lines
2.4 KiB
C
113 lines
2.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* CMA SysFS Interface
|
|
*
|
|
* Copyright (c) 2021 Minchan Kim <minchan@kernel.org>
|
|
*/
|
|
|
|
#include <linux/cma.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/slab.h>
|
|
|
|
#include "cma.h"
|
|
|
|
#define CMA_ATTR_RO(_name) \
|
|
static struct kobj_attribute _name##_attr = __ATTR_RO(_name)
|
|
|
|
void cma_sysfs_account_success_pages(struct cma *cma, unsigned long nr_pages)
|
|
{
|
|
atomic64_add(nr_pages, &cma->nr_pages_succeeded);
|
|
}
|
|
|
|
void cma_sysfs_account_fail_pages(struct cma *cma, unsigned long nr_pages)
|
|
{
|
|
atomic64_add(nr_pages, &cma->nr_pages_failed);
|
|
}
|
|
|
|
static inline struct cma *cma_from_kobj(struct kobject *kobj)
|
|
{
|
|
return container_of(kobj, struct cma_kobject, kobj)->cma;
|
|
}
|
|
|
|
static ssize_t alloc_pages_success_show(struct kobject *kobj,
|
|
struct kobj_attribute *attr, char *buf)
|
|
{
|
|
struct cma *cma = cma_from_kobj(kobj);
|
|
|
|
return sysfs_emit(buf, "%llu\n",
|
|
atomic64_read(&cma->nr_pages_succeeded));
|
|
}
|
|
CMA_ATTR_RO(alloc_pages_success);
|
|
|
|
static ssize_t alloc_pages_fail_show(struct kobject *kobj,
|
|
struct kobj_attribute *attr, char *buf)
|
|
{
|
|
struct cma *cma = cma_from_kobj(kobj);
|
|
|
|
return sysfs_emit(buf, "%llu\n", atomic64_read(&cma->nr_pages_failed));
|
|
}
|
|
CMA_ATTR_RO(alloc_pages_fail);
|
|
|
|
static void cma_kobj_release(struct kobject *kobj)
|
|
{
|
|
struct cma *cma = cma_from_kobj(kobj);
|
|
struct cma_kobject *cma_kobj = cma->cma_kobj;
|
|
|
|
kfree(cma_kobj);
|
|
cma->cma_kobj = NULL;
|
|
}
|
|
|
|
static struct attribute *cma_attrs[] = {
|
|
&alloc_pages_success_attr.attr,
|
|
&alloc_pages_fail_attr.attr,
|
|
NULL,
|
|
};
|
|
ATTRIBUTE_GROUPS(cma);
|
|
|
|
static const struct kobj_type cma_ktype = {
|
|
.release = cma_kobj_release,
|
|
.sysfs_ops = &kobj_sysfs_ops,
|
|
.default_groups = cma_groups,
|
|
};
|
|
|
|
static int __init cma_sysfs_init(void)
|
|
{
|
|
struct kobject *cma_kobj_root;
|
|
struct cma_kobject *cma_kobj;
|
|
struct cma *cma;
|
|
int i, err;
|
|
|
|
cma_kobj_root = kobject_create_and_add("cma", mm_kobj);
|
|
if (!cma_kobj_root)
|
|
return -ENOMEM;
|
|
|
|
for (i = 0; i < cma_area_count; i++) {
|
|
cma_kobj = kzalloc(sizeof(*cma_kobj), GFP_KERNEL);
|
|
if (!cma_kobj) {
|
|
err = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
cma = &cma_areas[i];
|
|
cma->cma_kobj = cma_kobj;
|
|
cma_kobj->cma = cma;
|
|
err = kobject_init_and_add(&cma_kobj->kobj, &cma_ktype,
|
|
cma_kobj_root, "%s", cma->name);
|
|
if (err) {
|
|
kobject_put(&cma_kobj->kobj);
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
out:
|
|
while (--i >= 0) {
|
|
cma = &cma_areas[i];
|
|
kobject_put(&cma->cma_kobj->kobj);
|
|
}
|
|
kobject_put(cma_kobj_root);
|
|
|
|
return err;
|
|
}
|
|
subsys_initcall(cma_sysfs_init);
|